India, April 28 -- Data from the Centers for Disease Control and Prevention shows that emergency room visits for tick bites are higher than usual across much of the United States, prompting a warning from health officials as peak tick season begins.

According to the CDC's Tick Bite Tracker, weekly ER visit rates for tick bites are at their highest level for this time of year since 2017 in every U.S. region except the South-Central area. In the third week of April, there were 85 tick bite-related visits per 100,000 ER visits, with the largest number of cases concentrated in the Northeast and Midwest. Tick bites are linked to roughly 500,000 new illnesses each year, the agency estimates.

Tick season typically peaks in April. While bites can...